If you are interested in an application, whether you are for or against it, you almost certainly will be interested in the outcome.
The original applicant of a planning application may disagree with the decision made by the authority, if this is the case they may lodge an appeal.
You can only comment on an appeal if it is a strategic or non-household application. Anyone can comment on an appeal by using the online appeals service.
You cannot provide further comments on an appeal for a householder application (for applications such as extensions or alterations), however, any previous comments submitted will be passed on to the Planning Inspectorate.